The Relative Biological Effectiveness of 180-Kevp and 22.5-Mevp X-Rays Determined from the Dose-Survival Curve of Saccharomyces cerevisiae

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Abstract
The RBE (relative biological effectiveness) of 22.5-mevp compared with 180-kevp X-rays was determined from the dose-survival curves of Saccharomyces cerevisiae, haploid. Based on the absorbed dose in the yeast suspension, the RBE was 1.06 [plus or minus] 0.04, a value not significantly different from 1. An RBE differing from 1.00 by 0.09 or more would have been considered a significant difference between the two beams.